APPENDIX I

PILOTS' CRUISING INSTRUCTIONS WITH ONE 170-GALLON

AUXILIARY FUEL TANK FOR P-40K AIRPLANES


1. Take-off.

Take-off distance - 2,200 feet ground run in zero wind, standard conditions:

Engine rpm

3,000 rpm

Manifold pressure

45.5 inches

Wing flaps

See a.

Rudder trim tab

2 degrees right

Elevator trim tab

See b.

Take-off speed

130 mph indicated

Fuel

Fuselage tank

Mixture

Full rich

a. Set wing flaps between 1/4 and 1/2 on cockpit control. This will give approximately 15 degrees down setting.

b. Set elevatortrim tab 1 degree tail heavy (Takeoff setting on dial).

c. Get speed to 145 mph as soon as practicable after take-off.

d. Get landing gear up as soon as possible after take-off.

e. Do not retract wing flaps below 160 mph.

f. Ship handles best with cowl flaps as nearly closed as possible while not exceeding coolant temperature of 1200C (2480F). Recommendtwo notches open from neutral for take-off.

NOTE: Ship may have a slight wallowing tendency in take-off-and climb, particularly if cowl flaps are too far open, This should be no cause for alarm; the ship is controllable in this condition.

EMERGENCY: In case of emergency immediately after take-off, DROP BELLY TANK .BEFORE LANDING.

g. If shortest possible take-off distance is desired, set wing flaps at 1/2 on cockpit control. if ample distance is available, between 1/4 and 1/2 gives better handling characteristics.

IMPORTANT: SET WING FLAPS BY LOWER1NG THEM COMPLETELY, THEN BRING THEM UP TO DESIRED SETTING WHILE GROUND CREW APPLIES AN UP LOAD ON THE FLAPS.

DO NOT TAKE-OFF WITHOUT FLAPS.

AFTER TAKE-OFF, RETRACT FLAPS GRADUALLY AND NOT UNDER 160 MPH.

2. Climb.

a. Normal Climb. - Climb at 160 mph at 2,600 rpm ani-37'.2 inches manifold pressure, automatic rich.

b. Cruising Climb.

(1) Climb at 160 mph at 2,280 rpm and 29.2 inches manifold pressure, automatic lean.

NOTE: Cruising climb will be most economical of fuel and is recommended when conditions permit a long, slow climb to cruising altitude.

(2) Do not allow speed to drop below 145 mph in climb.

(3) Adjust cowl flaps to give 1150C (2290F) to 1200C (248uF) coolant temperature.

(4) Climb to cruising altitude on rear fuselage tank, and cruise on rear fuselage tank until 30 minutes after takeoff.

3. Cruising Control.

The operating conditions given in table 1 or the Airspeed and RPM Chart have been set up as a simple and practical guide for maximum range cruising operation.

The Cruising Control Chart gives the exact conditions from which the Airspeed and RPM Chart and table 1 were derived, and included complete information on the essential operating conditions at any weight. Range and operating conditions for less than full fuel load may be predicted from the chart.

4. Cruising

a. Follow cruising control charts and table for maximum range.

b. Mixture setting in automatic lean.

c. Cowl flaps set to give 1150C (2390F) to 1200C (2480F) coolant temperature.

d. Use rear fuselage tank for 30 minutes after take-off, rearwingtankfor 15 minutes, and front wing tank for 15 minutes; then switch to belly tank until empty.

WARNING: DO NOT LAND WITH FULL BELLY TANK.

e. The recommended cruising altitude is 10,000 feet.

5. Emergency Only.

If it becomes necessary in an emergency to obtain the absolute maximum range:

a. DROP BELLY TANKAS SOON AS IT IS EMPTY.

b. If possible, reduce speed 10 mph below chart and rpm as low as practicable.

c. Lean out mixture by setting propeller in fixed pitch and leaningoutthe mixture control until 10 to 20 rpm decrease in engine speed is experienced. Return propeller to automatic. This operation must be done with caution because operating on too lean a mixture will cause engine damage and possible failure. Use only if absolutely necessary. If too close to idle cutoff, engine will stop; have sufficient altitude to recover.

6. General

a. Do not dive or stunt with belly tank attached.

b. Do not be alarmed at slight wallowing tendencies of the airplane in flight.

c. Stalling speeds are higher than normal with the belly tank attached; always keep safe flying speed.

d Do not exceed 30 inches manifold pressure in automatic lean.

e. DROP BELLY TANK

(1) If it is necessary to land and an appreciable amount of fuel remains in the tank.

(2) If the absolute maximum range must be obtained after belly tank is empty.